波浪中固定浮式结构与自由浮动结构窄缝间流场分析
时间:2020-10-21 20:38 来源:毕业论文 作者:毕业论文 点击:次
| 摘 要在全球经济不断发展的背景下，人类对石油天然气的需求量在不断增加。随着陆地存储量的减少和开采难度的增加，海洋油气的开采开始出现。浮式结构物作为海洋开发不可缺少的装备，其需求量也大大增加。由于海上浮式结构自身尺寸较大，其结构之间往往会出现远小于自身尺寸的窄缝，在特定的波浪工况下，窄缝间的流体会发生异于外围流场的运动，如波面升高、波浪力增大等。为探究窄缝间流体的耦合机理， 本文采用 Fine/Marine软件对固定式结构和自由浮动结构窄缝间的流场进行数值模拟。 本文研究了不同波浪工况和不同窄缝间距对小间距内流体运动的影响；同时，对比分析了单浮体和并排双浮体中自由浮动结构的运动和受力情况。研究发现，单浮体与并排双浮体之间的运动差异较大，特别是水平方向的运动；同时，两者在 Y 方向上的受力差异也较大；在分析波长对窄缝间流场的影响时发现，在波长为 1m 的工况下，窄缝间的波面升高幅度较大，可达到同等位置外围流场波高的四倍；在分析窄缝间距大小对流体运动影响时发现，在间距较小的情况下，波面升高现象明显，窄缝间流体的运动更加剧烈。综上所述， 本文对窄缝间流体的运动规律以及对并排双浮体运动响应作了一定研究，为今后浮式结构窄缝间的流场研究提供了参考。58412 毕业论文关键词：窄缝；波面升高；运动响应；Fine/Marine； AbstractUnder the background of the global economic development,Mankind's demand for oiland natural gas is increasing.With the decrease of the amount of land storage and theincrease of the difficulty of exploitation.The exploitation of offshore oil and gas began toappear,The floating structure is an indispensable equipment for the development of theocean.Its demand is also increased greatly,Because of its large size, the structure of thefloating structure often appears to be much smaller than the size of its own.Underparticular wave conditions,The fluid in the narrow gap can be different from the outer flowfield,Such as wave elevation, wave force etc.In order to explore the coupling mechanism of the fluid in the narrow gap,In thispaper, Fine/Marine software is used to simulate the flow field between the fixed structureand the free floating structure.In this paper, the effects of different wave conditions andnarrow gap spacing on the fluid motion in small space are studied;At the same time, the motion and force of the free floating structure of the singlefloating body and the side by side double floating bodies are compared and analyzed.It isfound that the difference between the movement of the single floating body and the side byside of the double floating body is relatively large, especially in the horizontal direction;Atthe same time, both in the Y direction of the stress difference is also larger;It is found thatunder the condition of wavelength 1m,the wave elevation between the narrow gap is lager,up to four times the same position of outer flow wave when analysing the effect ofwavelength on the flow field in the narrow gap.In the analysis of narrow spacing size offluid motion effects , it is found that in the smaller spacing, wave elevation phenomenonis obvious, narrow seam between the motion of the fluid is more intense.In summary, thispaper makes a deep study on the motion law of the fluid in the narrow gap and the motionresponse of the side by side,provides a reference for the study of the flow field of thefloating structure in the future. Keywords: narrow gap;wave elevation;motion response；Fine/Marine 目 录 第一章 绪论.. 1 1.1课题研究背景及意义... 1 1.2.1 多浮体干扰的理论研究..3 1.2.2 浮式结构窄缝间流体共振的数值模拟研究4 1.4 多浮体干扰的模型实验研究.7 (责任编辑：qin) |